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I remember Mr Hill. He was tall and thin and had a moustache. When I became a junior he sometimes did Playground Duty in the boys playground at the side of the school building. The older boys alerted us to the fact that Mr Hill would get us to line up at the end of playtime. Having done that, he would turn his back on us. Then, he would watch us in the reflection of his spectacles to see who was fidgeting or whispering, etc. But, thanks to the tip-off from the older boys, we always stood motionless and silent.
Also, there were three classrooms that could be directly accessed via the iron staircase.